In 1993 Acer Consultants requested D&P to develop  a design for Four Levant Maintenance Depot for the Istanbul Metro.  The scope of works included the following functions:

A Depot Requirement Report including:

• Definition of typical maintenance operations and representative work cycles
• Define typical work space arrangements for the maintenance tasks
• Confirmation that the maintenance staff facilities and amenities as specified in a Parsons Brinkerhoff report were required, and if so, were adequate
• Identification of stabling and train movement requirements, including access from the main line
• Identification of the space requirements for the depot facilities, including a block diagram showing the requirements
• Identification of any specific structural/foundation requirements, such as drop table pits
• Identification of space requirements for the Control centre 

A Technical Specification including:

• A list and technical specification for all maintenance equipment required
• Bill of Quantities
• Cost Estimates